Every hour your Mammoth TT Twin Speed Inline Fan operates, it should be able to shift a certain amount of air, with a number of factors having a bearing here, like the shape and size of your grow room and the quantity, power and type of lighting being operated. Now, don’t worry if this sounds confusing – a rough guide to finding a suitable model is outlined below:

• 100mm (4”) Mammoth TT Twin Speed Inline Fan (165m3/hour or 198m3/hour) – up to 1 x 400W light
• 125mm (5”) Mammoth TT Twin Speed Inline Fan (248m3/hour or 284m3/hour) – up to 1 x 600W light
• 150mm (6”) Mammoth TT Twin Speed Inline Fan (410m3/hour or 530m3/hour) – up to 2 x 600W lights
• 200mm (8”) Mammoth TT Twin Speed Inline Fan (530m3/hour or 690m3/hour) – up to 4 x 600W lights
• 250mm (10”) Mammoth TT Twin Speed Inline Fan (1064m3/hour or 1405m3/hour) – up to 8 x 600W lights

Plants consume CO2 and release humidity. At the same time, your grow lights and other hot bits of kit are increasing your grow room temperature. So you need to draw out hot, stale, humid, CO2 depleted air, and replace it with fresh, cooler, CO2 rich air. This is what’s known as air exchange. In each system, you need:

A fan: to draw air out

A filter: to remove odours before air is extracted

Ducting: to vent air where you need it

The beauty of an extraction kit is that you don’t need to worry about sizing everything up. You already know your carbon filter, fan & ducting will fit together. It’s the easiest answer to air exchange.

Using the items supplied in your kit, here’s how to configure an extraction system:

Carbon Filter > Duct Clip > Ducting (short) > Duct Clip > Extractor Fan > Duct Clip > Ducting

Plug in and turn on your fan prior to system assembly to check that the product works. We recommend initially arranging and attaching kit items on the floor, hanging up as one whole unit afterwards with chain or, for maximum convenience, Rope Ratchets (both supplied separately). Ensure that the arrow on the fan points in the opposite direction to the carbon filter – this indicates the direction of air flow (you want air to suck through the filter, not blow into it).

Tip: if you’re having trouble fitting ducting to either your fan or filter, you can use tape to hold it in place whilst you secure the duct clip.

In terms of where to locate your extraction system, we recommend hanging it at the top of the growing area, with the air exiting the tent or room from an opposite corner of where you intend to bring fresh air in – typically via an intake fan or open vent(s) positioned low down. This arrangement prevents you from immediately extracting away the fresher air coming in.

For best results and the most effective ventilation setup, you should draw in around 20% less air than you extract. In a tent, this stops air seeping out before it’s been through your filter. Users of small-to-medium sized tents can get away with just opening up the vents to allow enough air in, but we recommend installing an active intake system for tents measuring 1.2m x 2.4m and above. A Mammoth TT Twin Speed Inline Fan will work well for this task too – simply pick the model below your extractor fan and combine with suitable sized lengths of ducting and duct clips.